Energizer D Alkaline Industrial Batteries1.5v, Box of 12

good afternoon and welcome back to the workbench and where I've previously had the flu and that's why I haven't made a video for a while and I just felt pretty terrible and when I tried to get back into doing some more videos and first time I think it to Mike just failed miserably and completely unusable so and second wall now I'm finally trying third time lucky hopefully and to do another one which is just a quick little video about 9-volt batteries and specifically something I discovered which um maybe some of you already know it might be pretty obvious some reason I just hadn't thought of it and anyway I'm gonna share the idea because well you know why not anyway so like most people I suppose I have a bunch of smoke alarms and I have a bunch of multimeters okay well know most people done a bunch of multimeters but and have a bunch smoke alarms you'll take 9-volt batteries so well my